Thermal analysis and cooling system design for marine brushless DC motor

The purpose of this research is thermal analysis of a brushless permanent magnet motor with marine application. The advantages of brushless permanent magnet motors are creating high torque and power in proportion to their weight and size. But this issue leads to a large increase in engine temperature. Therefore, the design of the cooling system is essential for cooling and reducing the temperature of this engine. The engine has been thermal analyzed first without cooling system and then with different cooling systems. For the purpose of thermal analysis, the stator and the shell were first modeled and then simulated. The engine has been thermally analyzed first without cooling system and then with different cooling systems. In order to check the effect of the cooling system and choose an optimal and suitable cooling system for this engine, the maximum temperature in different cooling systems with the number of 4, 8 and 12 holes, the diameter of the holes various 3, 4 and 5 mm diameters and circular and oval cross-sections have been compared with each other and with the state without cooling system. The results showed that the temperature of this engine reaches about 416 ̊c without cooling system. Also, the cooling system with 8 circular 4 mm holes has been introduced as the most suitable cooling system for this engine.